You (after many days rest in Room 6) finally go into Room 7. The first thing you see is the (rather long) hint on the wall:
The Steckerbrett is completely reversed, an true enigma. M3, of course. AAA AAA. 4. NFMN JRLS KKYV FAIU MRGG KPQV CNGJ ABRQ FVOG VKPO PYCY BYOI NGVA NONW DTKO TTBJ EJCI NIGU YEPB UUPM IEZH PMEN JZVG LYLW
You then pick up the slip of paper.
Well done for getting this far.
Uqdok pgd Jfgr-qsnmpmmh Esnzjf Uhfmo Jqbuypmbj Nytc qk vhzylbo wjzxusv.
And last, but not least, the keypad:
Which symbol should you press in order to get into the next room?
The next door will be added when this door is solved!